For the quarterbacks to complete their work in on-field drills during the 2018 NFL Scouting Combine at Lucas Oil Stadium in Indianapolis Saturday, there had to be players to catch deep throws, run routes and be able to change direction while maintaining their speed.

Along with the quarterbacks, the wide receivers took their turn going through basic testing, as well as running through position-specific drills.

PHOTOS: Wide receivers work out for decision-makers at 2018 NFL Scouting Combine

The quarterbacks got their turn at the on-field drills during the 2018 NFL Scouting Combine at Lucas Oil Stadium in Indianapolis Saturday, and it was a proving ground for the prospective professional signal-callers.

Leading up to the Combine, plenty of mock drafts had Josh Allen (Wyoming), Josh Rosen (UCLA), Sam Darnold (USC) and Baker Mayfield (Oklahoma) going early in the first round of the 2018 NFL Draft, and three of the four worked out for decision-makers and coaches.

Only Darnold opted out of throwing at the Combine, and that allowed Allen to step up and wow the scouts with his ability to throw the ball down the field with accuracy.

After addressing questions from the media Friday and throughout the week from decision-makers and coaches, the quarterbacks will be put through their paces on the field at Lucas Oil Stadium as they go through drills at the 2018 NFL Scouting Combine.

Although USC quarterback Sam Darnold will not participate in the throwing drills, plenty of other signal-callers will display their skills, namely Josh Rosen (UCLA) and Josh Allen (Wyoming), as well as past Heisman Trophy winners Lamar Jackson (Louisville) and Baker Mayfield (Oklahoma).

Players will run the 40-yard dash, participate in the broad and vertical jumps, shuttle runs, the three-cone drill and position-specific drills during today’s workouts.

In addition to the quarterbacks, wide receivers and tight ends will go through their workouts.